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Monty Worthington Director of Project Development - Alaska

False Pass Tidal & Ocean Current Resource Reconnaissance Study. Monty Worthington Director of Project Development - Alaska. Presented to SWAMC Southwest Alaska Economic Summit & Membership Meeting March 5, 2014. False Pass Reconnaissance Study.

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Monty Worthington Director of Project Development - Alaska

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  1. False Pass Tidal & Ocean Current Resource Reconnaissance Study • Monty Worthington • Director of Project Development - Alaska • Presented to • SWAMC Southwest Alaska Economic Summit & Membership Meeting • March 5, 2014

  2. False Pass Reconnaissance Study • Contracted by the Aleutian Pribilof Islands Assoc. (APIA), ORPC organized and implemented a tidal current survey at False Pass. • Project partners made the study successful: • The Aleutian Pribilof Island Community Development Assoc. donated a vessel, captain, room and board. • University of Alaska-Anchorage (UAA) performed circulation modeling to identify sites likely to have high current velocities. • National Renewable Energy Laboratory loaned Acoustic Doppler Current Profiler (ADCP) and provided field technician to help deploy. • Benthic GeoScience was contracted to provide technical and field support during deployment. • APIA provided funding via a tribal energy grant received from the US Dept. of Energy.

  3. Candidate Site Selection Areas likely to have high current velocities and symmetric flow on flood and ebb tides were selected as potential ADCP deployment sites. Selection was also based on UAA modeling, local knowledge, and existing oceanographic data.

  4. Hazard Assessment with Scanning Sonar A bottom-mounted sonar was deployed to seven sites to assess hazards to successful ADCP deployment and retrieval.

  5. Two sites were selected and ADCPs were deployed. • 600 kHz Acoustic Wave and Current profiler loaned from NREL deployed at northern site offshore from False Pass Harbor • 300 kHz ADCP deployed at southern site in narrow con-striction of Isanotski Strait • Both deployed with redun-dant recovery systems to enhance recovery proba-bility in harsh high current environment. • Recovery scheduled after full lunar cycle (29.5 days) of data collection at end of October.

  6. Two water-level sensors were deployed to enhance UAA circulation model. • Water-level sensors deployed at southern and northern boundaries of modeling domain. • Model then hindcast to cover ADCP deployment period to assess model validity and provide insight into finer scale location of future ADCP deployments.

  7. ADCPs recovered (with some difficulty!) on October 30 and November 4.

  8. Data thru entire water column over deployment period From site S2 (top) and N2 (bottom), 10.5 meters above sea floor

  9. Tide Rose data to assess magnitude and flow symmetry From S2 (left) and N2 (right) ~ 10.5 meters above seafloor

  10. UAA modeling updated with water level and ADCP data

  11. Potential Recoverable Energy Using ORPC’s TidGen® Power System parameters rated at 150kW in a 5.4 knot current

  12. ORPC Power Systems TidGen® Power System 150 kW* 2012 TidGen® TGU RivGen® Power System 25kW* 2014 • Cobscook Bay, Maine • Tidal Energy Project • Single device TidGen® Power System connected to Bangor Hydro electric grid in September 2012. • First grid connected hydrokoinetictidal energy project in the Americas OCGen® Power System 600kW* 2016

  13. Cobscook Bay, Maine Tidal Energy Project

  14. Tidal energy technologies around the globe

  15. Next steps in development of False Pass tidal current resources • Refine UAA modeling • Expand upon resource assessment work • Scope environmental issues and complete study plans • Perform economic analysis

  16. Thank You! Questions? Monty Worthington Director of Project Development - Alaska mworthington@orpc.co (907) 339-7939 www.orpc.co

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